Pub Date : 2015-11-30DOI: 10.1109/SIPDA.2015.7339291
Qibin Zhou, Feifan Liu, Yu Cheng, Yang Zhao
Wind turbine converters may be damaged by lightning-induced surges. This paper provided an experimental study on the surge protection of converters in direct-driven permanent-magnetic wind turbines. Firstly, this paper describes the design of the experimental study and presents the obtained experimental results. Then, a discussion is presented about different earthing methods of the converter in the off-line state. Finally, the best way of earthing is found and some observations are discussed for the case when the converter is turned on.
{"title":"Experimental study on the surge protection of converters in direct-driven permanent-magnetic wind turbines","authors":"Qibin Zhou, Feifan Liu, Yu Cheng, Yang Zhao","doi":"10.1109/SIPDA.2015.7339291","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339291","url":null,"abstract":"Wind turbine converters may be damaged by lightning-induced surges. This paper provided an experimental study on the surge protection of converters in direct-driven permanent-magnetic wind turbines. Firstly, this paper describes the design of the experimental study and presents the obtained experimental results. Then, a discussion is presented about different earthing methods of the converter in the off-line state. Finally, the best way of earthing is found and some observations are discussed for the case when the converter is turned on.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"9 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114022896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-30DOI: 10.1109/SIPDA.2015.7339272
I. Pinto, O. Pinto
Belief that the moon has an effect on the weather is present for centuries. It is probably a result of the well-known effect of the moon's gravitational force on the ocean tides. It was only in the beginning of 1800s that scientists try to prove it. Most of them, however, didn't find any conclusive evidence. In earlier 1900s, a lunar tide on the surface air pressure was demonstrated, but its amplitude was found to be so small to produce any significant weather change. After 1950, several evidence that the lunar phases have an effect on precipitation and on ice nucleus concentrations were reported, giving a renew interest on the subject. In order to explain such evidence, some authors attributed the lunar influence to lunar modulation of meteoritic dust reaching the Earth, although others attributed this to gravitational tides or, even, a result of the lunar effect on the long wave circulation in the troposphere. In spite of such evidence, the prevailing view at the present time is that no appreciable effect on weather should be expected. In particular, the effect of moon on thunderstorm activity was a common believed of most navigators from the 1500s to 1800s centuries. Differently of precipitation, there is only three studies (published by the same author) trying to find the lunar influence on thunderstorm activity, all of them based on thunderstorm days for two relatively small periods (1930-1933 and 1942-1965) collected in 108 stations in the United States. The studies found an increase in the thunderstorm activity two days after full moon and attributed it to the lunar modulation of the earth's magnetic field in the geomagnetic tail and/or a unknown effect on the lower atmosphere caused by the aligning of Sun, Earth and moon. In this report, thunderstorm days collected in three stations in the South and Southeast regions of Brazil during 55 years and lightning data detected in the Southeast region in the last 15 years are analysed to investigate a possible dependence on lunar phases. As far as we known, this is the first study to use lightning data for this purpose. The results of the analysis show evidence of a decrease in the thunderstorm and lightning activity in the third quarter phase. We also found an increase in the lightning activity in the new phase, not observed in the thunderstorm data and less pronounced that the decrease in the quarter. The lack of a symmetric result with respect to the moon suggests that the effect is probably not due to gravitational tides and may be related to moon interaction with the Earth's magnetic field or other unknown effect. Since now lightning data are available for large regions and reasonable long periods, we encourage other researchers to search for similar effect in other countries.
{"title":"Moon effect on lightning","authors":"I. Pinto, O. Pinto","doi":"10.1109/SIPDA.2015.7339272","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339272","url":null,"abstract":"Belief that the moon has an effect on the weather is present for centuries. It is probably a result of the well-known effect of the moon's gravitational force on the ocean tides. It was only in the beginning of 1800s that scientists try to prove it. Most of them, however, didn't find any conclusive evidence. In earlier 1900s, a lunar tide on the surface air pressure was demonstrated, but its amplitude was found to be so small to produce any significant weather change. After 1950, several evidence that the lunar phases have an effect on precipitation and on ice nucleus concentrations were reported, giving a renew interest on the subject. In order to explain such evidence, some authors attributed the lunar influence to lunar modulation of meteoritic dust reaching the Earth, although others attributed this to gravitational tides or, even, a result of the lunar effect on the long wave circulation in the troposphere. In spite of such evidence, the prevailing view at the present time is that no appreciable effect on weather should be expected. In particular, the effect of moon on thunderstorm activity was a common believed of most navigators from the 1500s to 1800s centuries. Differently of precipitation, there is only three studies (published by the same author) trying to find the lunar influence on thunderstorm activity, all of them based on thunderstorm days for two relatively small periods (1930-1933 and 1942-1965) collected in 108 stations in the United States. The studies found an increase in the thunderstorm activity two days after full moon and attributed it to the lunar modulation of the earth's magnetic field in the geomagnetic tail and/or a unknown effect on the lower atmosphere caused by the aligning of Sun, Earth and moon. In this report, thunderstorm days collected in three stations in the South and Southeast regions of Brazil during 55 years and lightning data detected in the Southeast region in the last 15 years are analysed to investigate a possible dependence on lunar phases. As far as we known, this is the first study to use lightning data for this purpose. The results of the analysis show evidence of a decrease in the thunderstorm and lightning activity in the third quarter phase. We also found an increase in the lightning activity in the new phase, not observed in the thunderstorm data and less pronounced that the decrease in the quarter. The lack of a symmetric result with respect to the moon suggests that the effect is probably not due to gravitational tides and may be related to moon interaction with the Earth's magnetic field or other unknown effect. Since now lightning data are available for large regions and reasonable long periods, we encourage other researchers to search for similar effect in other countries.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114500325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-30DOI: 10.1109/SIPDA.2015.7339305
Matheus Jose Arruda Lyra, N. M. da Silva, N. Fedorova, V. Levit
Forecast of the Mesoscale Convective Complexes (MCC) is extremely important for the social and economic contexts of the Alagoas State (Northeast Brazil (NEB)) since they can cause several adverse phenomena. Some examples of these phenomena are intense rainfall, thunderstorms, flooding, and landslide. The main aim of this study was to analyze a connection between thunderstorms and MCC in the Alagoas area during two years period (2013-2014). Following data and models were used: (1) Review of the National Centers for Environmental Prediction (NCEP); (2) The European Center for Medium-Range Weather Forecasts (ECMWF); (3) GOES-13 satellite images from the Brazilian Forecast and Climate Study Center (CPTEC); (4) Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) and (5) Environmental and Water Resources Department of Alagoas (SEMARH). The MCC frequency between 2013 and 2014 was far lower related to the 2000-2010 period. Among the nine MCC cases observed, thunderstorms were reported twice. It was identified Direct influence of the Upper Tropospheric Cyclonic Vortex (UTCV) to the thunderstorms development was identified. This synoptic system is responsible for the numerous cases of storm in the NEB (Bashir et al., 2011). Thermodynamic study was based on the analysis of vertical profiles of temperature and humidity, forecasted up to 48 hours in advance. Forecast was elaborated used parcel trajectories from the HYSPLIT model in 10 standard levels. Vertical profiles with 12 h antecedence were considered satisfactory. Connections of the MCC development with the horizontal distribution of temperature and humidity (in the low and high levels) were studied. MCC formation and development occurred on the periphery of hot air core (up to 27°C) and relatively dry (80%). Temperatures decrease and there was no change in humidity at the time of MCC dissipation.
中尺度对流复合体(MCC)的预报对阿拉戈斯州(巴西东北部)的社会和经济环境非常重要，因为它们可以引起一些不利现象。这些现象的一些例子是强降雨、雷暴、洪水和滑坡。本研究的主要目的是分析两年间(2013-2014年)阿拉戈斯地区雷暴与MCC之间的联系。使用的数据和模型如下:(1)国家环境预测中心(NCEP)综述;(2)欧洲中期天气预报中心(ECMWF);(3)巴西预报与气候研究中心(CPTEC) GOES-13卫星图像;(4)混合单粒子拉格朗日积分轨迹(HYSPLIT)和(5)阿拉戈斯州环境与水资源部(SEMARH)。2013 - 2014年MCC频率远低于2000-2010年。在观察到的9个MCC病例中，有两次报告了雷暴。确定了对流层上层气旋涡(UTCV)对雷暴发展的直接影响。这种天气系统是造成东北地区众多风暴的原因(Bashir et al.， 2011)。热力学研究是基于温度和湿度的垂直分布分析，提前48小时预测。利用HYSPLIT模型的包裹轨迹在10个标准水平上进行了详细的预测。12小时的垂直剖面被认为是令人满意的。研究了MCC的发展与温度和湿度水平分布的关系(低层和高层)。MCC的形成和发展发生在热空气核心的外围(高达27°C)和相对干燥(80%)。MCC耗散时，温度下降，湿度无变化。
{"title":"Mesoscale Convective Complexes and thunderstorm events in the Alagoas State, the Northeast Brazil","authors":"Matheus Jose Arruda Lyra, N. M. da Silva, N. Fedorova, V. Levit","doi":"10.1109/SIPDA.2015.7339305","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339305","url":null,"abstract":"Forecast of the Mesoscale Convective Complexes (MCC) is extremely important for the social and economic contexts of the Alagoas State (Northeast Brazil (NEB)) since they can cause several adverse phenomena. Some examples of these phenomena are intense rainfall, thunderstorms, flooding, and landslide. The main aim of this study was to analyze a connection between thunderstorms and MCC in the Alagoas area during two years period (2013-2014). Following data and models were used: (1) Review of the National Centers for Environmental Prediction (NCEP); (2) The European Center for Medium-Range Weather Forecasts (ECMWF); (3) GOES-13 satellite images from the Brazilian Forecast and Climate Study Center (CPTEC); (4) Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) and (5) Environmental and Water Resources Department of Alagoas (SEMARH). The MCC frequency between 2013 and 2014 was far lower related to the 2000-2010 period. Among the nine MCC cases observed, thunderstorms were reported twice. It was identified Direct influence of the Upper Tropospheric Cyclonic Vortex (UTCV) to the thunderstorms development was identified. This synoptic system is responsible for the numerous cases of storm in the NEB (Bashir et al., 2011). Thermodynamic study was based on the analysis of vertical profiles of temperature and humidity, forecasted up to 48 hours in advance. Forecast was elaborated used parcel trajectories from the HYSPLIT model in 10 standard levels. Vertical profiles with 12 h antecedence were considered satisfactory. Connections of the MCC development with the horizontal distribution of temperature and humidity (in the low and high levels) were studied. MCC formation and development occurred on the periphery of hot air core (up to 27°C) and relatively dry (80%). Temperatures decrease and there was no change in humidity at the time of MCC dissipation.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122994983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-30DOI: 10.1109/SIPDA.2015.7339313
C. A. Morales Rodriguez, J. Neves, Evandro A. Moimza, Vinicius Roggerio, K. S. Camara, Nilo Rodrigues, R. S. Gondim, Felipe L. C. dos Santos
This document presents a brief overview of the Sferics Timing and And Ranging NETwork (STARNET) measurements over South America in the last 9 years. Since its beginning, STARNET measured more than 610 millions of sferics in the entire South America. The main hot spots are found over Maracaibo - Venezuela, northern Argentina, Paraguay, Bolivia, and Corumbá and Amazon basin in Brazil. The detection efficiency and location accuracy is highly dependent on the number of sensors available in the network that it is currently operating 11 VLF antennas.
{"title":"9 years of lightning measurements in South America as detected by STARNET","authors":"C. A. Morales Rodriguez, J. Neves, Evandro A. Moimza, Vinicius Roggerio, K. S. Camara, Nilo Rodrigues, R. S. Gondim, Felipe L. C. dos Santos","doi":"10.1109/SIPDA.2015.7339313","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339313","url":null,"abstract":"This document presents a brief overview of the Sferics Timing and And Ranging NETwork (STARNET) measurements over South America in the last 9 years. Since its beginning, STARNET measured more than 610 millions of sferics in the entire South America. The main hot spots are found over Maracaibo - Venezuela, northern Argentina, Paraguay, Bolivia, and Corumbá and Amazon basin in Brazil. The detection efficiency and location accuracy is highly dependent on the number of sensors available in the network that it is currently operating 11 VLF antennas.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128479480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-30DOI: 10.1109/SIPDA.2015.7339285
A. De Conti, Vinícius C. Oliveira, Raphael T. S. Lopes, Rodrigo O. Brochado, J. L. Silvino
This paper proposes a pair of two-port wideband models for a 10 kVA 7.967 kV/240-120 V single-phase transformer with center-tapped secondary used in distribution lines in Brazil. The models are valid from 10 Hz to few MHz and are derived from measurements of the admittance matrix and the voltage ratio between the high-voltage and low-voltage transformer terminals. Two different conditions are assumed for deriving the models for the transformer. One assumes that one of the low-voltage terminals is short-circuited, while the other assumes that the same terminal is left open-circuited. Both models are validated by means of comparisons with experimental data. It is shown that voltages transferred from the high-voltage side to the low-voltage side of the transformer reach higher amplitudes for the condition where one of the low-voltage terminals is left open-circuited.
针对巴西配电线路中使用的10 kVA 7.967 kV/240 ~ 120v中心抽头单相变压器，提出了一种双端口宽带模型。该模型在10hz到MHz范围内有效，是根据导纳矩阵和高压、低压变压器端子之间的电压比的测量得出的。在推导变压器模型时，假定了两种不同的条件。一种假设其中一个低压端子短路，而另一种假设同一端子处于开路状态。通过与实验数据的比较，验证了两种模型的正确性。结果表明，当其中一个低压端子处于开路状态时，从变压器高压侧传递到低压侧的电压幅值更高。
{"title":"Two-port wideband models of a single-phase distribution transformer with center-tapped secondary","authors":"A. De Conti, Vinícius C. Oliveira, Raphael T. S. Lopes, Rodrigo O. Brochado, J. L. Silvino","doi":"10.1109/SIPDA.2015.7339285","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339285","url":null,"abstract":"This paper proposes a pair of two-port wideband models for a 10 kVA 7.967 kV/240-120 V single-phase transformer with center-tapped secondary used in distribution lines in Brazil. The models are valid from 10 Hz to few MHz and are derived from measurements of the admittance matrix and the voltage ratio between the high-voltage and low-voltage transformer terminals. Two different conditions are assumed for deriving the models for the transformer. One assumes that one of the low-voltage terminals is short-circuited, while the other assumes that the same terminal is left open-circuited. Both models are validated by means of comparisons with experimental data. It is shown that voltages transferred from the high-voltage side to the low-voltage side of the transformer reach higher amplitudes for the condition where one of the low-voltage terminals is left open-circuited.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121040186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-30DOI: 10.1109/SIPDA.2015.7339288
A. Panicali, J. C. O. Silva, C. Barbosa, N. V. B. Alves
This paper presents a study on the overvoltages that appear across the separation distance between LPS and structure conductive parts when the former is struck by lightning. The overvoltage calculation is carried out in frequency-domain using the Method of Moments and the results are translated to time-domain by Fourier transform. The structure is represented by its steelwork and the voltages are computed for the standard waveforms corresponding to negative first strokes and subsequent strokes. The likelihood of insulation breakdown is assessed by the Equal Area Method, which takes into account the voltage waveform. It is shown that, for non-insulated LPS, sparks between LPS and structure steelwork are very likely to occur, both for first and subsequent strokes. The results support the proposal of bonding the LPS to the building steelwork, regardless of the condition of the latter. The paper also discusses how this issue is addressed in the international standard for lightning protection of structures.
{"title":"Separation distance between external LPS and structure conductive parts","authors":"A. Panicali, J. C. O. Silva, C. Barbosa, N. V. B. Alves","doi":"10.1109/SIPDA.2015.7339288","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339288","url":null,"abstract":"This paper presents a study on the overvoltages that appear across the separation distance between LPS and structure conductive parts when the former is struck by lightning. The overvoltage calculation is carried out in frequency-domain using the Method of Moments and the results are translated to time-domain by Fourier transform. The structure is represented by its steelwork and the voltages are computed for the standard waveforms corresponding to negative first strokes and subsequent strokes. The likelihood of insulation breakdown is assessed by the Equal Area Method, which takes into account the voltage waveform. It is shown that, for non-insulated LPS, sparks between LPS and structure steelwork are very likely to occur, both for first and subsequent strokes. The results support the proposal of bonding the LPS to the building steelwork, regardless of the condition of the latter. The paper also discusses how this issue is addressed in the international standard for lightning protection of structures.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"153 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125703717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-30DOI: 10.1109/SIPDA.2015.7339294
Zongxu Qiu, Hong Gao, Yuexin Yang
A new experimental platform designed and is being built for tower-triggered lightning observation in Shenzhen, China was introduced in this paper. The observation facilities contain several measurements focusing on the lightning strokes associated with one meteorological gradient tower (360m). The equipment deployed does not only include the direct current measurements like the shunt, Rogowski coil on the tower, and near field probing system like the electromagnetic field antenna, the meteorological environment factors and ground strip current measurements are also applied. The mainly purpose of building this platform and tower is to improve our understanding of the lightning phenomenon and its characteristics in southern china.
{"title":"Lightning parameters measurement systems and Instrumentation on meteorological gradient observation tower in Shenzhen China","authors":"Zongxu Qiu, Hong Gao, Yuexin Yang","doi":"10.1109/SIPDA.2015.7339294","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339294","url":null,"abstract":"A new experimental platform designed and is being built for tower-triggered lightning observation in Shenzhen, China was introduced in this paper. The observation facilities contain several measurements focusing on the lightning strokes associated with one meteorological gradient tower (360m). The equipment deployed does not only include the direct current measurements like the shunt, Rogowski coil on the tower, and near field probing system like the electromagnetic field antenna, the meteorological environment factors and ground strip current measurements are also applied. The mainly purpose of building this platform and tower is to improve our understanding of the lightning phenomenon and its characteristics in southern china.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129017264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-30DOI: 10.1109/SIPDA.2015.7339271
O. Pinto, A. C. V. Saraiva, G. Zepka
In 29 December 2014 four people were killed by lightning in Praia Grande beach, state of São Paulo, in the Southeast region of Brazil. This was the second largest number of fatalities due to a single lightning in the Brazilian history. In less than 30 minutes, 16 cloud-to-ground flashes occur in a distance less than 5 km from the location of the fatality, detected by the Brazilian Lightning Detection Network (BrasilDAT), in association with a thunderstorm related to a cold front. The article describes a new computational tool to predict the occurrence of this kind of thunderstorm, giving a forecast with great anticipation and large precision that can be used to provide prior alert for the population.
{"title":"A new tool to avoid lightning tragedies like in Praia Grande in December 2014","authors":"O. Pinto, A. C. V. Saraiva, G. Zepka","doi":"10.1109/SIPDA.2015.7339271","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339271","url":null,"abstract":"In 29 December 2014 four people were killed by lightning in Praia Grande beach, state of São Paulo, in the Southeast region of Brazil. This was the second largest number of fatalities due to a single lightning in the Brazilian history. In less than 30 minutes, 16 cloud-to-ground flashes occur in a distance less than 5 km from the location of the fatality, detected by the Brazilian Lightning Detection Network (BrasilDAT), in association with a thunderstorm related to a cold front. The article describes a new computational tool to predict the occurrence of this kind of thunderstorm, giving a forecast with great anticipation and large precision that can be used to provide prior alert for the population.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"171 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131653704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The design of lightning current measurement system on Shenzhen Meteorological Tower is demonstrated, and the basic principle of the Magnetic-optic crystal sensor which is used to measure lightning current is introduced in this paper. First, the surge test about Magnetic-optic crystal is done, the results show that Magnetic-optic crystal sensor has a good time response performance and can record the lightning current waveform well. Besides, it also has a reliable measurement accuracy. Then it is applied to the current measurements of artificially triggered lightning tower in Conghua, Guangdong, China. The results of lightning current measurement between Magnetic-optic crystal sensor and coaxial shunt are compared. The analysis showed that the current waveform is generally consistent and the Magnetic-optic measurement can reflect the change of lightning current truly. Therefore, The Magnetic-optic measurement would be a good way in the measurement of lightning current.
{"title":"Application of Magnetic-optic crystal materials in the measurement of lightning current","authors":"Hong Gao, Yuexin Yang, Zongxu Qiu, YiLan Luo, Dunxun Liu, Qingfeng Zeng","doi":"10.1109/SIPDA.2015.7339317","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339317","url":null,"abstract":"The design of lightning current measurement system on Shenzhen Meteorological Tower is demonstrated, and the basic principle of the Magnetic-optic crystal sensor which is used to measure lightning current is introduced in this paper. First, the surge test about Magnetic-optic crystal is done, the results show that Magnetic-optic crystal sensor has a good time response performance and can record the lightning current waveform well. Besides, it also has a reliable measurement accuracy. Then it is applied to the current measurements of artificially triggered lightning tower in Conghua, Guangdong, China. The results of lightning current measurement between Magnetic-optic crystal sensor and coaxial shunt are compared. The analysis showed that the current waveform is generally consistent and the Magnetic-optic measurement can reflect the change of lightning current truly. Therefore, The Magnetic-optic measurement would be a good way in the measurement of lightning current.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115853956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-30DOI: 10.1109/SIPDA.2015.7339339
A. Borghetti, F. Napolitano, C. Nucci, F. Tossani
The paper is motivated by the results obtained in a joint project between the Brazilian electric distribution utility AES Sul, the Federal University of Itajubá and the University of Bologna. It deals with some aspects relevant to the assessment of the lightning performance of medium voltage (MV) overhead power distribution lines and of MV distribution feeders mainly composed by overhead lines. In particular, the paper focuses on the effects of direct strokes to the line conductors and on the representation of both the AC voltage at the utility frequency and the flashovers of the insulators. Results are presented with reference to lines with standard or compact configuration as well as to a feeder with complex topology.
{"title":"Advancements in insulation coordination for improving lightning performance of distribution lines","authors":"A. Borghetti, F. Napolitano, C. Nucci, F. Tossani","doi":"10.1109/SIPDA.2015.7339339","DOIUrl":"https://doi.org/10.1109/SIPDA.2015.7339339","url":null,"abstract":"The paper is motivated by the results obtained in a joint project between the Brazilian electric distribution utility AES Sul, the Federal University of Itajubá and the University of Bologna. It deals with some aspects relevant to the assessment of the lightning performance of medium voltage (MV) overhead power distribution lines and of MV distribution feeders mainly composed by overhead lines. In particular, the paper focuses on the effects of direct strokes to the line conductors and on the representation of both the AC voltage at the utility frequency and the flashovers of the insulators. Results are presented with reference to lines with standard or compact configuration as well as to a feeder with complex topology.","PeriodicalId":296478,"journal":{"name":"2015 International Symposium on Lightning Protection (XIII SIPDA)","volume":"254 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117325415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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